(Honest question, I'm curious.)
As far as I can see the banking system in aggregate has more deposits than loans:
https://www.federalreserve.gov/releases/h8/current/default.h...
The original question I was trying to answer was "If everyone gets cash from loans, who'll be the depositors putting cash in the bank to be loaned?". I just don't think that question is well-posed. A bank creating a loan requires new cash deposits of only R x loan_amount, where R is the reserve requirement. For making payroll this ought to be almost nothing.
Ok. That would be reserves. But it's not like some deposits are backed and others are not (leaving aside the existence of different kinds of deposits) - what you have is a total amount of deposits and a total amount of reserves.
But banks have more deposits than loans even now. Because they need to get money from somewhere.